Population > 4.3 million
Leading indicator > The world's third favorite city after London and Paris, according to Anholt GMI City Brands Index
Fast companies > Lend Lease; Telstra
Already near the top of most livability surveys, Sydney is focused on becoming carbon-neutral by next year. Its newest precinct, a redevelopment of East Darling Harbour called Barangaroo, is designed to actually supply water and power back to the rest of the city. Danish architect Jan Gehl has been charged with ensuring that an eco-friendly Sydney remains people friendly too.